Statistical Study of Pi1B Magnetic Pulsations at Conjugate Hemisphere - The Observation of Wave Propagation at Substorm Onset

Details Statistical Study of Pi1B Magnetic Pulsations at Conjugate Hemisphere - The Observation of Wave Propagation at Substorm Onset Statistical Study of Pi1B Magnetic Pulsations at Conjugate Hemisphere - The Observation of Wave Propagation at Substorm Onset

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm31a0385k&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SM31A-0385

Other

2487 Wave Propagation (0689, 3285, 4275, 4455, 6934), 2723 Magnetic Reconnection (7526, 7835), 2736 Magnetosphere/Ionosphere Interactions (2431), 2752 Mhd Waves And Instabilities (2149, 6050, 7836), 2790 Substorms

Scientific paper

Pi1B magnetic pulsations, characterized by broadband bursts in the ULF range (periods of 1 to 40 s), have been well-correlated with substorm onsets. Recent work has shown that these pulsations are observed at geosynchronous orbit in conjunction with onset, as well as on the ground in the vicinity of the onset location. Specifically, work has shown that these pulsations provide an onset signature with timing precision the order of a few seconds and, also, that the ground stations that detect this signature need only be located within a couple of hours in MLT of the onset. In this study, observations at nominally conjugate stations (South Pole and Iqaluit) are used to determine differences in substorm onsets in opposite hemispheres. This is a statistical study spanning a few years and includes several tens of events, where the presence of substorms are confirmed using fluxgate magnetometer and other data. The raw results show a wide range in onset times, with no clear seasonal dependence that might indicate a tendency for onset to occur in one hemisphere or the other. For periods of perhaps a few weeks, however, there are times when onset does occur preferentially in one hemisphere. Differences in onset times are interpreted in the context of various solar wind parameters and comparisons are also made to Pi2 onsets and occurrences of PiC pulsations.

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